FALCO HYPOLEUCUS, Gowa. 
White-breasted Falcon. 
Falco hypoleucus, Gould in Proc. of Zool. Soc., Part VIII. p. 162. 
Tue only specimen of this genuine and noble Falcon in my collection, or indeed that nas ever come under 
my notice, was presented to my assistant Mr. Gilbert during his sojourn at Swan River by Mr. L. Burgess, 
who stated that it had been killed over the mountains about sixty miles from the coast. It is highly 
interesting, as adding another species to the true or typical Falcons, and as affording another proof of the 
beautiful analogies which exist between species of certain groups of the southern and northern hemisphere ; 
this bird being as clearly a representative of the Jerfalcon of Europe as the Fulco melanogenys is of the 
Peregrine, and the Falco frontatus of the Hobby; but as I have more fully entered into this subject in my 
observations on the genus, it is unnecessary again to detail them here. 
It is a source of regret to me, that I am unable to furnish any particulars respecting the peculiar habits 
of the White-breasted Falcon, or even to form any definite opinion as to whether it undergoes the same 
changes of plumage as the Iceland and Jerfalcons: to all appearance, my specimen, which is rather less 
than a male Jerfalcon, has the adult plumage. 
Head and all the upper surface greyish brown, the feathers of the head having a fine stripe of black 
down the centre; chin and all the under surface white, with a fine line of black down the centre, passing 
into a spatulate form near the tip; outer webs and tips of the primaries brownish black, the extreme 
ends being whitish ; their inner webs whitish, crossed by numerous narrow bars, fading into a point as 
they approach the edge ; tail grey, obscurely barred with brown, and tipped with buff. 
The Plate represents the bird of the natural size. 
